A casino is a gambling establishment. While casinos often add luxuries to make them more appealing to patrons, such as restaurants and free drinks, the basic idea is that people come to gamble and play games of chance. Casinos have existed as long as there have been people who want to win money.

Gambling probably predates written history, with primitive protodice (cut knuckle bones or carved six-sided dice) found in archaeological digs. The first modern casinos, however, developed in the 16th century during a gambling craze that swept Europe. During this time, Italian aristocrats held private parties in venues called ridotti. While technically gambling was illegal, the houses rarely attracted attention from the Inquisition.

Today, casinos are located all over the world. Some are based in large cities, such as Las Vegas and Atlantic City, while others are isolated resorts, like the one in Macau. A growing number of casinos are also available online.

Because of the large amounts of money that are handled within a casino, security is a major concern. Casinos use cameras and other technological means to ensure the safety of their patrons and workers. They also employ rules of conduct and behavior to reduce the possibility of cheating or stealing.

Most casinos feature a variety of gambling games, including slot machines and table games. Craps, roulette and blackjack are the most common table games. Most casinos offer several variants of these games, and some have special rules to help them stand out from the competition.